A sure guide to distillers, and all dealers in spiritous liquors, for discovering the true proportion of water and alchohol [sic] in any ... compound; and how to make it exactly proof, by a new-constructed hydrometer / [Benjamin Martin].

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A sure guide to distillers, and all dealers in spiritous liquors, for discovering the true proportion of water and alchohol [sic] in any ... compound; and how to make it exactly proof, by a new-constructed hydrometer / [Benjamin Martin]. Public Domain Mark. Source: Wellcome Collection.